While I hesitate to re-open this discussion, I feel I must because of the obvious, to me, way that the thinking is wandering off the purpose of a true...
I just posted some pics of my sort of finished 16' 3part vaka proa in the files section (PedalSail Proa). Most of the last 10 or so pics in the list are from...
While posting pics in my file today I noticed the section is almost full. I deleted most of another file I had there from over a year ago. Perhaps we should...
Hi Good idea on the pf2 group, I'll set it up Monday. I'm interested in your foam outrigger. What layup did you use over the foam, and how hard is the...
Hi Kevin, I have built other foam boats and boards, and consider two layers of 6 oz to be minimum to prevent damage from sitting on a beach or much dragging up...
dynawing1@... wrote: <Big snip> ... One only has to look at Abbott & von Doenhoff "Theory of Wing Section" where the data on about 75 wing sections is...
... Firstly, the problem of designing a sail is different from that of designing a wing. An aircraft wing must satisfy the conditions of high lift at lower...
Each piece has a 4mm ply bulkhead, doubled where the bolts go through. There are four 1/4" (6mm) stainless bolts, one in each corner, for each pair of...
Gary, Thanks for your explanation. I read it through while checking the photos and can see how well it works. I thought your construction method of the ama was...
Can anyone give answers to any of these questions? - What are the advantages, if any, of having rocker in a hull which does not have to be very manouverable? -...
G'day, 1) No rocker is easy to build, higher top speed, lower light air performance. Unless the boat doesn't draw much, it will be hard to steer at low...
... If the rocker leads to small prismatic or waterplane coefficient, it will generate pitching specially when displacement length ratio is high. Looks nice in...
I've created the proa_file2 group at http://groups.yahoo.com/group/proa_file2/ If we overflow here we can post images and files there. It might be a good...
... For elliptical cross section hulls, I am assuming that there is slight leeway in spite of the foils, though not necessarily in the case of twin rudders....
... A symmetrically built hull when heeled 5-10 degrees will exhibit a waterplane shape which is adversely asymmetrical (bulging to leeward). An asymmetrically...
Tom and Ron I've followed with some homework ;) Please find in /Files/Hull_types four drawings of four hull types: deep-V-asymmetrical, deep-V-symmetrical, ...
... I'll give an answer. Whether anyone else agrees with me is a different matter! 1. Rocker allows you to use weight shift fore-and-aft to move the centre of ...
Ron It took me some more time to produce some output, hope it's not too late. As I'm not professional designer I cannot prepare data for you in those fancy...
... centre of ... reducing drag ... shift ... the ... Well, I'll give my thaughts Rocker increases the draught at the centre of the length. This has The...
... A better question might be "can any two people give the same answers?" You've kicked off a good discussion, way to go. ... My 21' hull has about 6" of...
Thanks Tom, Makes perfect sense. I think I was tring to reduce the angle of attack of the hull, ie having an assymetric bow, but I can see that would also...
Thanks Tom, As usual you are able to put the theory in a nutshell clear for everybody. One of the possibilities for performance improvement for proas is the...
ABE.com has the following listed: ********************************** ALDEN, WILLIAM L. THE FLYING PROA HARPER'S NEW MONTHLY MAGAZINE, 1877 HARPER'S NEW MONTHLY...
-Mal or anyone, how do I avoid confusing camber and thickness? Brian Cady ... [snip] In my testing of the ... which ... in ... with a ... mechanisn to ... ...
... From: "Janusz Ostrowski" <oj1jo@...> ... Yes! Kudos for looking at design variations while keeping the key parameters constant. ... I depends on the...
By example: A single surface fabric sail has a thickness approaching 0% of the chord, but will usually be cambered (curved in section from luff to leach) in...
